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1.发明授权
公开(公告)号：US3703454A
公开(公告)日：1972-11-21
申请号：US3703454D
申请日：1970-05-21
发明人： NAKASE YOSHIAKI , YOSHIDA MASARU , ITO AKIHIKO , IWAI TADASHI , HAYASHI KOICHIRO , OKAMURA SEIZO , KOJIMA KATSUMI
摘要： IN A PROCESS FOR POLYMERIZING TETRAOXANE, SULFUR OR AN ORGANIC SULFUR COMPOUND WHICH IS ADMIXED TO TETRAOXANE ACTS IS POLYMERIZATION INITIATOR FOR TETRAOXANE. SOME OF THE ORGANIC SULFUR COMPOUNDS, SUCH AS THIIRANES, THIOCYAMATES AND THRTHIANOXIDES, IMPROVE HEAT STABILITY OF THE PRODUCED POLYOXYMETHYLENE REMARKABLY.
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公开(公告)号：US3616368A
公开(公告)日：1971-10-26
申请号：US3616368D
申请日：1969-05-07
发明人： ISHIGAKI ISAO , ITO AKIHIKO , IWAI TADASHI
CPC分类号： B29C71/04 , B29C2035/0827 , B29K2059/00 , C08G2/10
摘要： Polyoxymethylenes are obtained by first irradiating trioxane and/or tetraoxane with ionizing radiation, then contacting the irradiated trioxane and/or tetraoxane with nonirradiated trioxane and/or tetraoxane, and then maintaining the resulted mixture under the polymerizing condition to thereby effect polymerization of the whole system including the nonirradiated trioxane and/or tetraoxane by the action of active species formed in the irradiated trioxane and/or tetraoxane to give polyoxymethylenes readily with a minimum dosage required for such irradiation.
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3.发明授权
公开(公告)号：US3686085A
公开(公告)日：1972-08-22
申请号：US3686085D
申请日：1970-07-28
发明人： ITO AKIHIKO , NAKASE YOSHIAKI , YOSHIDA MASARU , SAKAMOTO MASAHIRO , KAETSU ISAO , IWAI TADASHI , HAYASHI KOICHIRO , OKAMURA SEIZO
CPC分类号： C08G2/10
摘要： IODINE OR BROMINE IS ADVANTAGEOUSLY EMPLOYED AS AN INITIATOR IN THE POLYMERIZATION OF TETRAOXANE. THE POLMERIZATION YIELD IS INCREASED WHEN A HALOGENOHYDROCARBON IS USED AS AN INITIATOR IN ADDITION TO IODINE OR BROMINE. AN OXYMETHYLENE POLYMER HAVING EXCELLENT HEAT-STABILITY IS OBTAINED BY ADDING AN ACETAL OR ACETAL TO THE POLYMERIZATION SYSTEM. ALSO, THE POLYMERIZATION IS FURTHER PROMOTED BY MEANS OF AN IONIZING RADIATION OR AN ULTRAVIOLET LIGHT.
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公开(公告)号：US3684767A
公开(公告)日：1972-08-15
申请号：US3684767D
申请日：1970-01-06
发明人： ITO AKIHIKO , YOSHIDA MASARU , NAKASE YOSHIAKI , IWAI TADASHI , HAYASHI KOICHIRO , OKAMURA SEIZO
CPC分类号： C08G2/02 , C08G2/10 , Y10S522/911
摘要： Tetraoxane is polymerized in the presence of alkyl acetal, represented by the general formula: (WHEREIN R1 and R3 are each an aliphatic hydrocarbon residue, having one to four carbon atoms; and R2 and R4 are each hydrogen or an aliphatic hydrocarbon residue, having one to three carbon atoms) to form polyoxymethylene. The polyoxymethylene so made has superior thermal stability and excellent strength and is obtained at a high yield in one step.
摘要翻译： 四烷基在烷基缩醛的存在下聚合，由以下通式表示：
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5.发明授权Polymerization of tetraoxane in the presence of an acetal and a sulfur initiator 失效在乙醇和硫酸钠引发剂存在下，四氢呋喃的聚合
公开(公告)号：US3677922A
公开(公告)日：1972-07-18
申请号：US3677922D
申请日：1970-06-19
发明人： ITO AKIHIKO , NAKASE YOSHIAKI , KOJIMA KATSUMI , YOSHIDA MASARU , IWAI TADASHI , HAYASHI KOICHIRO , OKAMURA SEIZO
摘要： A THERMALLY STABILIZED OXYMETHYLENE POLYMER IS OBTAINED BY POLYMERIZING TETRAOXANE IN THE PRESENCE OF AN ACETAL AND A POLYMERIZATION INITATOR SELECTED FROM THE GROUP CONSISTING OF SULFUR AND AN ORGANIC SULFUR COMPOUND. IRRADIATION BY AN IONIZING RADIATION OF AN ACTINIC LIGHT CAN ADVANTAGEOUSLY BE EMPLOYED IN THE POLYMERIZATION. SAID THERMAL STABILITY IS FURTHER IMPROVED, WHEN TETRAOXANE IS POLYMERIZED BY USING A SPECIFIC COMBINATION OF AN ACETAL SUCH AS METHYLAL, ETHYLAL, 1,3-DIOXOLANE, 1,3DIOXANE, ETC. AND AN INITIATOR SUCH AS THIIRANES, THIOCYANATES, ISOTHIOCYANATES, ETHYLENETHIOUREA, TRITHIANOXIDES, ECT.
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6.发明授权
公开(公告)号：US3917563A
公开(公告)日：1975-11-04
申请号：US40849073
申请日：1973-10-23
发明人： NAKASE YOSHIAKI , YOSHIDA MASARU , IWAI TADASHI , ITO AKIHIKO
IPC分类号： C08G2/10
CPC分类号： C08G2/10
摘要： Pure and high molecular weight polyoxymethylene can be efficiently and economically produced in good yield by the polymerization of tetraoxane using a radical-forming material such as a peroxide, some nitrogen-containing compounds, a gaseous mixture containing ozone, an aqueous or organic solvent solution of hydrogen peroxide, and the like without requiring the coexistence of any known initiators for cationic polymerization.
摘要翻译： 通过使用自由基形成材料如过氧化物，一些含氮化合物，含臭氧的气体混合物，含有臭氧的水溶液或有机溶剂溶液，可以有效地和经济地制备纯的和高分子量的聚甲醛， 过氧化氢等，而不需要任何已知的用于阳离子聚合的引发剂共存。
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7.发明授权Method for the stabilizing of polyoxy-methylene using high energy radiation and acetic anhydride 失效使用高能量辐射和乙酸酐稳定聚甲基苯乙烯的方法
公开(公告)号：US3553090A
公开(公告)日：1971-01-05
申请号：US3553090D
申请日：1967-05-12
发明人： YAMASHINA HISAO , ITO AKIHIKO , IWAI TADASHI , YAYASHI KOICHIRO , OKAMURA SEIZO
摘要： THE PRESENT DISCLOSURE IS DIRECT TO E STERIFICATION OF HIGHLY CRYSTALLINE POLYOXYMETHYLENE INDUCED BY IONIZING RADIATION IN THE PRESENCE OF ACETIC ANHYDRIDE. THE POLYOXYMETHYLENE OF HIGHLY CRYSTALLINE STRUCTURE, WHICH IS NOT EASILY ESTERIFIED, IS NOW THOROUGHLY ESTERIFIED IN A HETEROGENOUS SYSTEM AT RATHER LOW TEMPERATURE BY APPLYING AN IONIZING RADIATION AND THUS ITS THERMAL STABILITY IS REMARKABLY IMPROVED.
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